Student at Faculty of Law Banasthali Vidyapith Rajasthan.
Simply written documents before the elders will not count for an actual divorce at all. You will have to go through a proper process for that as the second marriage is illegal since the first one is still valid. For 6 years your 1st husband has not talked to you. Therefore, you can take the ground of desertion (Factum Deserendi and Animus Deserendi) here if possible. you cannot file any case related to 498A or DV here.
Kindly refer to a physical legal counsel for your case for a better expedition of this situation.
Marriage a second marrige during subsistence of a valid marriage is am offence of bigamy under IPC. Written agreement executed before elders is a null and void and nonest in eye of law and is not binding between the spouses. Try to settle the matter amicably without abusing process of law.